Karamba3D

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Comment by Andrei Raducanu on April 18, 2015 at 3:03pm

What I don't get is why in the simply supported plate and beam examples one of the ends doesn't move horizontally when the beam/plate gets bent.

It does have the freedom to do so and in order to keep the length constant it should do so, yet it doesn't. Please answer if You can

Comment by Andrei Raducanu on April 18, 2015 at 9:44am

Can curved folding simulations be done using Karamba?
Something along these lines :

Comment by Karamba3D on April 15, 2015 at 12:03am

Elisa, you could try to place two elements in the same spot. One with, one without eccentricity and add corresponding loads to them.

Best, C.

Comment by Elisa Cheung on April 14, 2015 at 3:27pm

Clemens,

Thanks for your response. However, I'm still having trouble with the ecce-loc. I want to change ONLY the eccentricity of the prestress load , and not offset the other uniform loads. Is there a way to do that?

Comment by Karamba3D on April 13, 2015 at 11:45pm

Hi Elisa,

in Karamba 1.1.0 the post-tension load is attached to the eccentric beam element (see PreTensionLoad_EccentricBeam.gh).

The trapezoid cross section is filled (when rendered it looks hollow though). The box cross section is hollow.

Best,

Clemens

Comment by Elisa Cheung on April 13, 2015 at 6:33pm

Hey guys, I'm having two issues.

Is there any way to change the eccentricity of the post-tension load? I changed the ecce-loc input but that only changes the centroid of where the point load acts -- the post-tension load seems to be unaffected.

2. How do I get a filled trapezoid cross section? It appears to be hollow at the moment. 

Thanks for your help in advance!

Comment by Nicholas Rawitscher on March 31, 2015 at 11:58am

Hey guys! do you know where to find the "point-load" component in the latest version of Karamba? thank you for your help

Comment by Karamba3D on January 8, 2015 at 11:14pm

Leonardo:

in Karamba 1.0.5 the cross section optimization algorithm only considers normal forces for buckling. The next version (Karamba 1.1.0) takes full account of the EC3 formulas including lateral torsional buckling and interaction values according to annex B.

Best,

Clemens

Comment by Leonardo on January 8, 2015 at 3:53pm

Clemens, thanks for your quick answer.

I have carefully read the appendix and the way for calculating the buckling length is clear. However I have still one questions:

seems to be that adopting Eurocode3 (eq. 6.47) only the normal forces are compared with the critical buckling load. Am I right?

Can we want take into account both, bending and axial compression, as suggested by Eurocode3 (Eq. 6.3.3)? 

Many thanks,

Leonardo

Comment by Karamba3D on January 7, 2015 at 11:02pm

Hi Leonardo,

the Cross Section Optimization component takes into account buckling for members (see the appendix of the Karamba manual). The assumed buckling length is the distance between two nodes that connect to more than three beams or to a support or double that distance in case one end is free. The buckling lengths can be set manually via the 'ModifyBeam'-component.
If you have 'huge' bending moments in your structure then buckling will have little effect on the result. 

Sometimes so called global buckling can govern a design (think e.g. of a compressed girder of a truss structure). In such cases one has to guess the buckling length or do a buckling analysis (which will be possible in Karamba 1.1.0). 

Best,

Clemens

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